I am having a bear of a time finding any updated JQGrid documentation.
the best one I could find is over a year old: http://www.secondpersonplural.ca/jqgriddocs/index.htm
Is there a new one somewhere?
Look at here. You can find the reference on the documentation from here.
UPDATED: The new features implemented in the free jqGrid fork of jqGrid are described here, in the wiki articles and in READMEs to every version of free jqGrid.